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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36865ef9ace863f9dcbdbe97329274d51ff2f84c9208b548f3384c97497e03c' 
  AND token = 'NDnDNCOFVxpkT6BzfQJmr5rovy7KuOQsrPOhSFiHgaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}